Hello,
I've got a similar issue with two Dell computers. My main work PC is the primary, and all check boxes advised in earlier posts are cleared. On the "slave" unit which has no keyboard and mouse, Multiplicity is setup as a secondary.
On the slave/secondary Dell (new XPS 2021 edition), I'm no longer able to put the computer to sleep when Multiplicity is installed. When I click start > power > sleep, the laptop briefly sleeps and then wakes back up again. This is regardless of whether I use the shared mouse (preferred) or the laptop's own trackpad/keyboard.
I'm running Multiplicity V3.57, Build 00103 on both units. I have Windows 10 21H2 19044.1387 running on the slave PC.
On event viewer on the slave PC, I see a Kernel-Power event ID 507 stating that the system is exiting Connected Standby with reason: "Input Keyboard" or "Input Mouse" depending on what I used to trigger the sleep function.
With Multiplicity "unloaded" using the tooltray menu, the system sleeps without problem.
I've recently bought the full licence for this, so hoping a fix can be found.
Thanks team.